Photonic–phononic systems that mix photons and acoustic waves have been actively investigated for the development of next-generation integrated photonics for signal processing. Here, we propose a new method of arbitrary RF signal shaping using active control of optically driven acoustic-wave interference, offering new photonic–phononic–microwave signal processing schemes with MHz linewidths at GHz carrier frequencies. The demonstrated system consists of two suspended optical waveguides and an asymmetric Mach–Zehnder interferometer. The two waveguides generate acoustic waves at a 3.03 GHz carrier frequency with a 3.3 MHz bandwidth, and one of the paths of the asymmetric interferometer experiences phase modulation induced by the acoustic waves. Then, the interferometer converts the phase information to RF signals of complicated shapes using a linear combination of multiple optical envelopes. This RF signal-shaping method will open new applications of optomechanical systems for microwave photonics.

中文翻译：

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通过光驱动声波干扰的相干控制进行片上射频信号整形

混合光子和声波的光子-声子系统已被积极研究，以开发用于信号处理的下一代集成光子学。在这里，我们提出了一种使用光驱动声波干扰的主动控制来进行任意射频信号整形的新方法，提供了在 GHz 载波频率下具有 MHz 线宽的新光子-声子-微波信号处理方案。演示的系统由两个悬挂的光波导和一个不对称的马赫-曾德尔干涉仪组成。两个波导产生具有 3.3 MHz 带宽的 3.03 GHz 载波频率的声波，并且不对称干涉仪的路径之一经历由声波引起的相位调制。然后，干涉仪使用多个光学包络的线性组合将相位信息转换为复杂形状的射频信号。这种射频信号整形方法将为微波光子学的光机械系统开辟新的应用。